Number Plate Rules in the UK
Legal requirements for displaying number plates — spacing, fonts, colours, and penalties.
Legal Display Requirements
All vehicles on UK roads must display number plates that conform to strict legal standards set by the DVLA and the Road Vehicles (Display of Registration Marks) Regulations 2001. Non-compliant plates can result in a fine of up to £1,000 and an MOT failure.
Plates must be made from reflective material — white at the front and yellow at the rear. They must show the registration number in the mandatory font (Charles Wright) with precise character dimensions and spacing. No stylistic alterations are permitted.
Character Dimensions and Spacing
Each character on a standard UK plate must be 79mm tall and 50mm wide (except the number 1 and letter I). The stroke width must be 14mm. There must be an 11mm space between characters and a 33mm space between groups of characters.
These dimensions apply to standard vehicles. Motorcycles and certain older vehicles have different size requirements. Plates must also have a minimum 11mm margin on all sides.
What's Not Allowed
You must not alter the spacing or arrangement of characters to make the plate spell something different from the official registration. This is one of the most commonly broken rules — rearranging '5' and 'S' or adjusting gaps to create words is illegal regardless of how it's done.
Bolt heads, fixing screws, or any other device that alters the appearance of any character is not permitted. Coloured screws, 3D gel letters in non-standard colours, and tinted plate covers are all non-compliant. Ghost plates (plates designed to be unreadable by cameras) are illegal.
Permitted Additions
Plates may display a GB or UK identifier (with or without the Union flag), the flag of England, Scotland, Wales, or the EU flag with GB letters. Since 2021, new plates must show the UK identifier rather than the EU symbol for international travel.
A number plate supplier's name, postcode, or BSI mark may also appear, but only in the area below the registration number and in characters no more than 3mm tall.
Penalties for Non-Compliance
Displaying an illegal number plate can result in a fixed penalty notice of up to £1,000. Your vehicle will also fail its MOT if the plates don't meet legal standards. In extreme cases, the police can instruct you to remove non-compliant plates immediately.
If your personalised registration is deliberately altered to misrepresent the actual characters, the DVLA has the power to withdraw the registration entirely — meaning you'd lose the plate and receive a replacement standard registration.